and the "washington post" reported the national security agency collects roughly five billion records a day on the location of cell phones worldwide, based on documents leaked by former n.s.a. contractor edward snowden. >> woodruff: on the "newshour" online right now, archaeologists have discovered that we're all mutts. new tests on the oldest-known human d.n.a. reveal that homo sapiens have more ancestors than we had previously thought. read about that on our science page. all that and more is on our website newshour.pbs.org. >> ifill: and that's the "newshour" for tonight. on thursday, fast-food workers plan strikes in 100 cities across the country to protest low-wages. i'm gwen ifill. >> woodruff: and i'm judy woodruff. we'll see you online and again here tomorrow evening. for all of us here at the "pbs newshour," thank you and good night. >> major funding for the pbs newshour has been provided by: ♪ ♪ moving our economy for 160 years. bnsf, the engine that connects us. >> support also comes from carnegie corporation of new york, a foundation created to do what andrew carnegie